Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872) / M. Aghasyan [et al.]

Уровень набора: Physics Letters BАльтернативный автор-лицо: Aghasyan, M., Mher;Akhunzyanov, Ruslan, R. R.;Burtsev, V. E., mathematician, Senior Lecturer of Tomsk Polytechnic University, 1991-, Vitaly Evgenjevich;Chumakov, A. G., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1992-, Aleksandr Grigorjevich;Dusaev, R. R., specialist in the field of nuclear physics, Engineer of Tomsk Polytechnic University, 1988-, Renat Ramilyevich;Levchenko, E. A., mathematician, technician, Senior Lecturer of Tomsk Polytechnic University, candidate of physico-mathematical Sciences, 1988-, Evgeny Anatolievich;Lyubovitskiy (Lyubovitskij), V. E., physicist, Professor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany), 1963-, Valery Efimovich;Mamon, S. A., physicist, laboratory assistant-researcher of Tomsk Polytechnic University, 1989-, Sergey Aleksandrovich;Vasilishin, B. I., engineer-physicist, laboratory researcher at Tomsk Polytechnic University, 1990-, Bogdan IvanovichКоллективный автор (вторичный): Национальный исследовательский Томский политехнический университет, Исследовательская школа физики высокоэнергетических процессов, (2017- )Язык: английский.Резюме или реферат: We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb..Примечания о наличии в документе библиографии/указателя: [References.: 46 tit.].Тематика: электронный ресурс | труды учёных ТПУ | X (3872) | photoproduction | tetraquark | exotic charmonia | фотопродукция | тетракварки | чармоний Ресурсы он-лайн:Щелкните здесь для доступа в онлайн | Щелкните здесь для доступа в онлайн
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[References.: 46 tit.]

We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ. Its mass and width are consistent with those of the X(3872). The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− shows disagreement with previous observations for X(3872). The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of X(3872) with C=−1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb.

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